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HI302 – User’s Manual
Figure 7.8 – HIRT Block
14. After the device related to the HIRT block has been identified, it is also possible to read and
write on the specific variables, by using the HVT block on on-line mode. The HVT block must also
have both the MODE_BLK.TARGET and MODE_BLK.ACTUAL = AUTO. Then, just write the
device HART TAG (HART_TAG parameter of HIRT block), in the DEV_TAG_SEL (DEV_TAG_SEL
= LD301-1A) parameter, to start reading the specific variables in the HVT parameters. Refer to the
allocation map from the HVT block to the device, so that you can relate the HVT parameters to the
variables on the HART device. The allocation maps for all equipment with the configuration built-in
the HI302 are shown in the Appendix C.
15. As soon as HART_TAG is written, the HVT block starts the update, by sending all the reading
commands in the configuration, to the LD301. See that the BLK_EXEC_STATE parameter changes
to UPDATING and then goes to UPDATED at the end of the process, which lasts about 2 minutes.
Moreover, it shows on the HCD_DEVICE_INFO and HCD_SELECTED parameters information
about the selected configuration.
16. To make some writing, the process is the same as for the HIRT. The next figure shows the HVT
being updated.
7.4